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Bridge type synchronous rectification circuit

A bridge rectifier circuit and synchronous rectification technology, which is applied in electrical components, regulating electrical variables, and high-efficiency power electronic conversion to reduce circuit costs, improve power efficiency, and simplify circuits.

Active Publication Date: 2013-05-08
SHENZHEN VAPEL POWER SUPPLY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a bridge-type synchronous rectification circuit to avoid the problem that the current loop cannot be reset due to an excessively large duty cycle when the current loop of the detection circuit is placed between the input capacitor and the switch tube; Or when the current loop is placed between the two bridge arms, it cannot work normally and stably because the current loop detects negative current

Method used

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  • Bridge type synchronous rectification circuit
  • Bridge type synchronous rectification circuit
  • Bridge type synchronous rectification circuit

Examples

Experimental program
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Effect test

Embodiment 1

[0022] like image 3 As shown, the bridge synchronous rectification circuit of the present invention is composed of an input capacitor, an isolation transformer, a bridge rectification circuit on the primary side of the isolation transformer, a current-mode PWM control circuit module of the bridge circuit, and a synchronous rectification output on the secondary side of the isolation transformer. Circuit, and current detection circuit.

[0023] The bridge circuit in this embodiment is a full bridge circuit, which includes a first bridge arm composed of a first switch tube Q1 and a second switch tube Q2, and a bridge arm composed of a third switch tube Q3 and a fourth switch tube Q4. Composed of the second bridge arm, the input capacitor C3 is connected across the two ends of the two bridge arms and connected to the positive and negative input terminals of the input power supply, and the two ends of the primary side T1-A of the isolation transformer are respectively connected to...

Embodiment 2

[0031] like Figure 6 As shown, the difference between this embodiment and Embodiment 1 is only the connection relationship between the bridge circuit part and the corresponding current-type PWM control circuit module. The bridge circuit of this embodiment is a half-bridge circuit, and two capacitors are used C2 and C3 replace the third switch tube and the fourth switch tube in Embodiment 1, and the second driver in Embodiment 1 is correspondingly removed.

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PUM

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Abstract

The invention discloses a bridge-type synchronous rectification circuit, which improves the current detection circuit of the traditional synchronous rectification circuit. The current detection circuit includes a current transformer, a first diode, a second diode, a fifth switch tube, The sixth switching tube; the first winding of the current transformer is connected between the midpoints of the two bridge arms of the bridge rectifier circuit, the drain of the fifth switching tube is connected to the anode of the first diode, and the sixth The drain of the switch tube is connected to the anode of the second diode, the cathode of the first diode is connected to the second diode, the source of the fifth switch tube and the source of the sixth switch tube are grounded; the current The two ends of the second winding of the transformer are respectively connected to the anodes of the first diode and the second diode; and by controlling the on-off of the fifth and sixth switching tubes, the current transformer is connected to the second winding when the circuit is empty. The second winding is short-circuited. Therefore, the current detection circuit cannot detect the reverse current.

Description

technical field [0001] The invention relates to a bridge type synchronous rectification circuit. Background technique [0002] Driven by the market demand of low voltage, high current and high power density, bridge synchronous rectification is becoming more and more widely used. Because of high efficiency requirements, the duty cycle of the power supply works at a duty cycle of nearly 100% even at low voltage input and even during the entire working process. At this time, if the current loop is placed between the two bridge arms and the input capacitor (the circuit diagram is as follows figure 1 As shown), the current loop loses the reset time and enters the magnetic saturation state and cannot perform current detection. [0003] When the current loop is placed between the two bridge arms (circuit diagram as figure 2 As shown), the bridge rectification makes the current flowing in both directions of the current loop can be detected by the current loop. When the power su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M7/219
CPCY02B70/10H02M3/33573H02M1/0009H02M7/219
Inventor 钟启豪李战伟刘取仁黄铭杰李世峰
Owner SHENZHEN VAPEL POWER SUPPLY TECH